A steam power station has an overall efficiency of 20% and 0.5 kg of coal is burnt per kWh of electrical energy generated. Calculate the calorific value of the fuel. Heat equivalent of 1 kWh is 860 kcal.

• A. 8600 kcal/kg
• B. 344 kcal/kg
• C. 860 kcal/kg
• D. 2150 kcal/kg